International Standards and Conformity Assessment for all electrical, electronic and related technologies

News release – 2009 Number 13

First IECEx Conformity Mark License to Finnish Vaisala Oyj

Granted to Vaisala Oyj of Finland for use on humidity and temperature transmitters designed for hazardous environments


Geneva, Switzerland, 2009-06-25 The International Electrotechnical Commission (IEC) is pleased to announce that the first IECEx Conformity Mark License (Ex Mark) was granted to Vaisala Oyj of Finland for use on humidity and temperature transmitters designed for hazardous environments. The Ex Mark was granted by VTT, a Finland-based leading applied research organization that provides high-end technology solutions and innovation services, including IECEx certification. VTT was one of the first IECEX certification bodies approved to issue the Mark.


The Ex Mark, launched in 2008 by IECEx, the IEC System for Certification to Standards relating to Equipment for use in Explosive Atmospheres, is issued by approved IECEx certifiers (ExCBs) located in IECEx participating countries for equipment that is covered by an IECEx Certificate of Conformity and hence has been tested and manufactured under systems that are under ongoing surveillance by ExCBs. Once granted an Ex mark, a company can use it on all equipment covered by an IECEx Certificate of Conformity.


IECEx certification is adequate proof of Ex-protection in every country participating in the system and guarantees that the equipment has access to the market without additional tests. The Ex Mark adds visibility.


The Vaisala equipment that received the IECEx Certificate of Conformity was the Humidity and Temperature Transmitters Series HMT360, used for example in the pharmaceutical, chemical and petrochemical industries, where humidity and temperature measurements are essential parameters to guarantee a safe environment. While the HMT360 equipment is already covered by the European ATEX approval and five different national approvals, obtaining the Ex Mark for the HMT360 transmitters was key to Vaisala to market the product globally.

Vaisala Group

The Vaisala Group, headquartered in Finland, develops, manufactures and markets products and services for environmental and industrial measurement. Its major customer groups include national meteorological services, aviation authorities, defense forces, road and rail authorities, land and water resource management agencies, research institutes, insurance companies, public utilities and industry worldwide. Vaisala has offices and operations in Finland, North America, France, the United Kingdom, Germany, India, China, Sweden, United Arab Emirates, Malaysia, Japan and Australia.


VTT Technical Research Centre of Finland is a leading applied research organization in Northern Europe, part of the Finnish innovation system under the domain of the Ministry of Employment and Economy. Assessments, testing, certifications and inspections are among the services offered by VTT. Certification of electrical equipment for explosive environments according to the IECEx System, which includes type approval of equipment, quality approval of the manufacturer’s production system and right to use the voluntary IECEx Certification Mark, is part of their services.


IEC Contact

Gabriela Ehrlich
Head of Communications
Tel: +41 22 919 02 78
Email: Gabriela Ehrlich


IECEx Contact

Chris Agius
Executive Secretary
Tel: +61 2 8206 6940
Email: Chris Agius